Finding the Fourth Proportional to 76,686.57, 105,736.95 and 52,499.16

Step by Step Solution

1. Step 1: Write the proportion equation
   76,686.57 : 105,736.95 = 52,499.16 : x
2. Step 2: Convert to fraction form
   76,686.57/105,736.95 = 52,499.16/x
3. Step 3: Cross multiply
   76,686.57x = 105,736.95 × 52,499.16
4. Step 4: Simplify right side
   76,686.57x = 5,551,101,055.96
5. Step 5: Solve for x
   x = 5,551,101,055.96/76,686.57
6. Step 6: Final answer
   x = 72,386.87