Finding the Fourth Proportional to 72,019.61, 108,031.40 and 19,428.94

Step by Step Solution

1. Step 1: Write the proportion equation
   72,019.61 : 108,031.40 = 19,428.94 : x
2. Step 2: Convert to fraction form
   72,019.61/108,031.40 = 19,428.94/x
3. Step 3: Cross multiply
   72,019.61x = 108,031.40 × 19,428.94
4. Step 4: Simplify right side
   72,019.61x = 2,098,935,367.21
5. Step 5: Solve for x
   x = 2,098,935,367.21/72,019.61
6. Step 6: Final answer
   x = 29,143.94