Finding the Fourth Proportional to 128,144.89, 176,839.24 and 70,788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   128,144.89 : 176,839.24 = 70,788.15 : x
2. Step 2: Convert to fraction form
   128,144.89/176,839.24 = 70,788.15/x
3. Step 3: Cross multiply
   128,144.89x = 176,839.24 × 70,788.15
4. Step 4: Simplify right side
   128,144.89x = 12,518,122,647.01
5. Step 5: Solve for x
   x = 12,518,122,647.01/128,144.89
6. Step 6: Final answer
   x = 97,687.26