Finding the Fourth Proportional to 31,147.47, 42,983.06 and 18,400.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,147.47 : 42,983.06 = 18,400.50 : x
2. Step 2: Convert to fraction form
   31,147.47/42,983.06 = 18,400.50/x
3. Step 3: Cross multiply
   31,147.47x = 42,983.06 × 18,400.50
4. Step 4: Simplify right side
   31,147.47x = 790,909,703.53
5. Step 5: Solve for x
   x = 790,909,703.53/31,147.47
6. Step 6: Final answer
   x = 25,392.42