Finding the Fourth Proportional to 79,238.74, 109,348.50 and 42,939.40

Step by Step Solution

1. Step 1: Write the proportion equation
   79,238.74 : 109,348.50 = 42,939.40 : x
2. Step 2: Convert to fraction form
   79,238.74/109,348.50 = 42,939.40/x
3. Step 3: Cross multiply
   79,238.74x = 109,348.50 × 42,939.40
4. Step 4: Simplify right side
   79,238.74x = 4,695,358,980.90
5. Step 5: Solve for x
   x = 4,695,358,980.90/79,238.74
6. Step 6: Final answer
   x = 59,255.85