Finding the Fourth Proportional to 31,125.61, 42,953.93 and 16,978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,125.61 : 42,953.93 = 16,978.96 : x
2. Step 2: Convert to fraction form
   31,125.61/42,953.93 = 16,978.96/x
3. Step 3: Cross multiply
   31,125.61x = 42,953.93 × 16,978.96
4. Step 4: Simplify right side
   31,125.61x = 729,313,059.31
5. Step 5: Solve for x
   x = 729,313,059.31/31,125.61
6. Step 6: Final answer
   x = 23,431.29