Finding the Fourth Proportional to 128,644, 177,528.72 and 72,055.24

Step by Step Solution

1. Step 1: Write the proportion equation
   128,644 : 177,528.72 = 72,055.24 : x
2. Step 2: Convert to fraction form
   128,644/177,528.72 = 72,055.24/x
3. Step 3: Cross multiply
   128,644x = 177,528.72 × 72,055.24
4. Step 4: Simplify right side
   128,644x = 12,791,874,526.49
5. Step 5: Solve for x
   x = 12,791,874,526.49/128,644
6. Step 6: Final answer
   x = 99,436.23