Finding the Fourth Proportional to 102,572.87, 141,659.69 and 78,112.18

Step by Step Solution

1. Step 1: Write the proportion equation
   102,572.87 : 141,659.69 = 78,112.18 : x
2. Step 2: Convert to fraction form
   102,572.87/141,659.69 = 78,112.18/x
3. Step 3: Cross multiply
   102,572.87x = 141,659.69 × 78,112.18
4. Step 4: Simplify right side
   102,572.87x = 11,065,346,990.54
5. Step 5: Solve for x
   x = 11,065,346,990.54/102,572.87
6. Step 6: Final answer
   x = 107,877.92