Finding the Fourth Proportional to 261,061.61, 391,649.81 and 83,586.56

Step by Step Solution

1. Step 1: Write the proportion equation
   261,061.61 : 391,649.81 = 83,586.56 : x
2. Step 2: Convert to fraction form
   261,061.61/391,649.81 = 83,586.56/x
3. Step 3: Cross multiply
   261,061.61x = 391,649.81 × 83,586.56
4. Step 4: Simplify right side
   261,061.61x = 32,736,657,966.37
5. Step 5: Solve for x
   x = 32,736,657,966.37/261,061.61
6. Step 6: Final answer
   x = 125,398.21