Finding the Fourth Proportional to 31,123.50, 42,935.63 and 21,055.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,123.50 : 42,935.63 = 21,055.47 : x
2. Step 2: Convert to fraction form
   31,123.50/42,935.63 = 21,055.47/x
3. Step 3: Cross multiply
   31,123.50x = 42,935.63 × 21,055.47
4. Step 4: Simplify right side
   31,123.50x = 904,029,764.12
5. Step 5: Solve for x
   x = 904,029,764.12/31,123.50
6. Step 6: Final answer
   x = 29,046.53