Finding the Fourth Proportional to 31,125.47, 42,953.27 and 16,978.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,125.47 : 42,953.27 = 16,978.61 : x
2. Step 2: Convert to fraction form
   31,125.47/42,953.27 = 16,978.61/x
3. Step 3: Cross multiply
   31,125.47x = 42,953.27 × 16,978.61
4. Step 4: Simplify right side
   31,125.47x = 729,286,647.23
5. Step 5: Solve for x
   x = 729,286,647.23/31,125.47
6. Step 6: Final answer
   x = 23,430.55