Finding the Fourth Proportional to 289,036,871.72, 398,871,178.17 and 156,877,895.48

Step by Step Solution

1. Step 1: Write the proportion equation
   289,036,871.72 : 398,871,178.17 = 156,877,895.48 : x
2. Step 2: Convert to fraction form
   289,036,871.72/398,871,178.17 = 156,877,895.48/x
3. Step 3: Cross multiply
   289,036,871.72x = 398,871,178.17 × 156,877,895.48
4. Step 4: Simplify right side
   289,036,871.72x = 62,574,071,000,979,704
5. Step 5: Solve for x
   x = 62,574,071,000,979,704/289,036,871.72
6. Step 6: Final answer
   x = 216,491,655.99