Finding the Fourth Proportional to 31,403.03, 43,338.60 and 17,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,403.03 : 43,338.60 = 17,978.50 : x
2. Step 2: Convert to fraction form
   31,403.03/43,338.60 = 17,978.50/x
3. Step 3: Cross multiply
   31,403.03x = 43,338.60 × 17,978.50
4. Step 4: Simplify right side
   31,403.03x = 779,162,713.51
5. Step 5: Solve for x
   x = 779,162,713.51/31,403.03
6. Step 6: Final answer
   x = 24,811.70