Finding the Fourth Proportional to 102,018.17, 140,784.95 and 56,694.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,018.17 : 140,784.95 = 56,694.72 : x
2. Step 2: Convert to fraction form
   102,018.17/140,784.95 = 56,694.72/x
3. Step 3: Cross multiply
   102,018.17x = 140,784.95 × 56,694.72
4. Step 4: Simplify right side
   102,018.17x = 7,981,763,320.46
5. Step 5: Solve for x
   x = 7,981,763,320.46/102,018.17
6. Step 6: Final answer
   x = 78,238.64