Finding the Fourth Proportional to 261,521.76, 392,196.78 and 83,986.77

Step by Step Solution

1. Step 1: Write the proportion equation
   261,521.76 : 392,196.78 = 83,986.77 : x
2. Step 2: Convert to fraction form
   261,521.76/392,196.78 = 83,986.77/x
3. Step 3: Cross multiply
   261,521.76x = 392,196.78 × 83,986.77
4. Step 4: Simplify right side
   261,521.76x = 32,939,340,756.60
5. Step 5: Solve for x
   x = 32,939,340,756.60/261,521.76
6. Step 6: Final answer
   x = 125,952.58