Finding the Fourth Proportional to 261,142.15, 391,722.51 and 83,626.10

Step by Step Solution

1. Step 1: Write the proportion equation
   261,142.15 : 391,722.51 = 83,626.10 : x
2. Step 2: Convert to fraction form
   261,142.15/391,722.51 = 83,626.10/x
3. Step 3: Cross multiply
   261,142.15x = 391,722.51 × 83,626.10
4. Step 4: Simplify right side
   261,142.15x = 32,758,225,793.51
5. Step 5: Solve for x
   x = 32,758,225,793.51/261,142.15
6. Step 6: Final answer
   x = 125,442.12