Finding the Fourth Proportional to 85,630.91, 128,298.69 and 56,761.83

Step by Step Solution

1. Step 1: Write the proportion equation
   85,630.91 : 128,298.69 = 56,761.83 : x
2. Step 2: Convert to fraction form
   85,630.91/128,298.69 = 56,761.83/x
3. Step 3: Cross multiply
   85,630.91x = 128,298.69 × 56,761.83
4. Step 4: Simplify right side
   85,630.91x = 7,282,468,431.00
5. Step 5: Solve for x
   x = 7,282,468,431.00/85,630.91
6. Step 6: Final answer
   x = 85,044.86