Finding the Fourth Proportional to 31,402.91, 43,338.42 and 17,978.37

Step by Step Solution

1. Step 1: Write the proportion equation
   31,402.91 : 43,338.42 = 17,978.37 : x
2. Step 2: Convert to fraction form
   31,402.91/43,338.42 = 17,978.37/x
3. Step 3: Cross multiply
   31,402.91x = 43,338.42 × 17,978.37
4. Step 4: Simplify right side
   31,402.91x = 779,154,149.98
5. Step 5: Solve for x
   x = 779,154,149.98/31,402.91
6. Step 6: Final answer
   x = 24,811.53