Finding the Fourth Proportional to 79,038.90, 109,073.42 and 42,740.10

Step by Step Solution

1. Step 1: Write the proportion equation
   79,038.90 : 109,073.42 = 42,740.10 : x
2. Step 2: Convert to fraction form
   79,038.90/109,073.42 = 42,740.10/x
3. Step 3: Cross multiply
   79,038.90x = 109,073.42 × 42,740.10
4. Step 4: Simplify right side
   79,038.90x = 4,661,808,878.14
5. Step 5: Solve for x
   x = 4,661,808,878.14/79,038.90
6. Step 6: Final answer
   x = 58,981.20