Finding the Fourth Proportional to 42,123.60, 58,108.68 and 31,379.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,123.60 : 58,108.68 = 31,379.76 : x
2. Step 2: Convert to fraction form
   42,123.60/58,108.68 = 31,379.76/x
3. Step 3: Cross multiply
   42,123.60x = 58,108.68 × 31,379.76
4. Step 4: Simplify right side
   42,123.60x = 1,823,436,432.32
5. Step 5: Solve for x
   x = 1,823,436,432.32/42,123.60
6. Step 6: Final answer
   x = 43,287.76