Finding the Fourth Proportional to 128,145.89, 176,840.62 and 70,789.15

Step by Step Solution

1. Step 1: Write the proportion equation
   128,145.89 : 176,840.62 = 70,789.15 : x
2. Step 2: Convert to fraction form
   128,145.89/176,840.62 = 70,789.15/x
3. Step 3: Cross multiply
   128,145.89x = 176,840.62 × 70,789.15
4. Step 4: Simplify right side
   128,145.89x = 12,518,397,175.27
5. Step 5: Solve for x
   x = 12,518,397,175.27/128,145.89
6. Step 6: Final answer
   x = 97,688.64