Finding the Fourth Proportional to 86,669.84, 129,782.82 and 59,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   86,669.84 : 129,782.82 = 59,978.88 : x
2. Step 2: Convert to fraction form
   86,669.84/129,782.82 = 59,978.88/x
3. Step 3: Cross multiply
   86,669.84x = 129,782.82 × 59,978.88
4. Step 4: Simplify right side
   86,669.84x = 7,784,227,611.21
5. Step 5: Solve for x
   x = 7,784,227,611.21/86,669.84
6. Step 6: Final answer
   x = 89,814.72