Finding the Fourth Proportional to 102,345.78, 141,284.61 and 72,155.70

Step by Step Solution

1. Step 1: Write the proportion equation
   102,345.78 : 141,284.61 = 72,155.70 : x
2. Step 2: Convert to fraction form
   102,345.78/141,284.61 = 72,155.70/x
3. Step 3: Cross multiply
   102,345.78x = 141,284.61 × 72,155.70
4. Step 4: Simplify right side
   102,345.78x = 10,194,489,933.78
5. Step 5: Solve for x
   x = 10,194,489,933.78/102,345.78
6. Step 6: Final answer
   x = 99,608.31