Finding the Fourth Proportional to 81,728.66, 112,784.78 and 45,429.16

Step by Step Solution

1. Step 1: Write the proportion equation
   81,728.66 : 112,784.78 = 45,429.16 : x
2. Step 2: Convert to fraction form
   81,728.66/112,784.78 = 45,429.16/x
3. Step 3: Cross multiply
   81,728.66x = 112,784.78 × 45,429.16
4. Step 4: Simplify right side
   81,728.66x = 5,123,717,816.18
5. Step 5: Solve for x
   x = 5,123,717,816.18/81,728.66
6. Step 6: Final answer
   x = 62,691.81