Finding the Fourth Proportional to 31,123.35, 46,691.10 and 12,400.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,123.35 : 46,691.10 = 12,400.20 : x
2. Step 2: Convert to fraction form
   31,123.35/46,691.10 = 12,400.20/x
3. Step 3: Cross multiply
   31,123.35x = 46,691.10 × 12,400.20
4. Step 4: Simplify right side
   31,123.35x = 578,978,978.22
5. Step 5: Solve for x
   x = 578,978,978.22/31,123.35
6. Step 6: Final answer
   x = 18,602.72