Finding the Fourth Proportional to 31,023.20, 42,810.72 and 16,875.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,023.20 : 42,810.72 = 16,875.20 : x
2. Step 2: Convert to fraction form
   31,023.20/42,810.72 = 16,875.20/x
3. Step 3: Cross multiply
   31,023.20x = 42,810.72 × 16,875.20
4. Step 4: Simplify right side
   31,023.20x = 722,439,462.14
5. Step 5: Solve for x
   x = 722,439,462.14/31,023.20
6. Step 6: Final answer
   x = 23,287.07