Finding the Fourth Proportional to 86,561.64, 129,843.42 and 30,399.40

Step by Step Solution

1. Step 1: Write the proportion equation
   86,561.64 : 129,843.42 = 30,399.40 : x
2. Step 2: Convert to fraction form
   86,561.64/129,843.42 = 30,399.40/x
3. Step 3: Cross multiply
   86,561.64x = 129,843.42 × 30,399.40
4. Step 4: Simplify right side
   86,561.64x = 3,947,162,061.95
5. Step 5: Solve for x
   x = 3,947,162,061.95/86,561.64
6. Step 6: Final answer
   x = 45,599.44