Finding the Fourth Proportional to 132,989.76, 183,528.72 and 72,561.60

Step by Step Solution

1. Step 1: Write the proportion equation
   132,989.76 : 183,528.72 = 72,561.60 : x
2. Step 2: Convert to fraction form
   132,989.76/183,528.72 = 72,561.60/x
3. Step 3: Cross multiply
   132,989.76x = 183,528.72 × 72,561.60
4. Step 4: Simplify right side
   132,989.76x = 13,317,137,569.15
5. Step 5: Solve for x
   x = 13,317,137,569.15/132,989.76
6. Step 6: Final answer
   x = 100,136.56