Finding the Fourth Proportional to 91,870.77, 126,778.46 and 56,120.61

Step by Step Solution

1. Step 1: Write the proportion equation
   91,870.77 : 126,778.46 = 56,120.61 : x
2. Step 2: Convert to fraction form
   91,870.77/126,778.46 = 56,120.61/x
3. Step 3: Cross multiply
   91,870.77x = 126,778.46 × 56,120.61
4. Step 4: Simplify right side
   91,870.77x = 7,114,884,229.46
5. Step 5: Solve for x
   x = 7,114,884,229.46/91,870.77
6. Step 6: Final answer
   x = 77,444.48