Finding the Fourth Proportional to 385,614.72, 532,142.72 and 215,848.64

Step by Step Solution

1. Step 1: Write the proportion equation
   385,614.72 : 532,142.72 = 215,848.64 : x
2. Step 2: Convert to fraction form
   385,614.72/532,142.72 = 215,848.64/x
3. Step 3: Cross multiply
   385,614.72x = 532,142.72 × 215,848.64
4. Step 4: Simplify right side
   385,614.72x = 114,862,282,397.90
5. Step 5: Solve for x
   x = 114,862,282,397.90/385,614.72
6. Step 6: Final answer
   x = 297,867.99