Finding the Fourth Proportional to 128,359.59, 177,135.43 and 70,997.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128,359.59 : 177,135.43 = 70,997.88 : x
2. Step 2: Convert to fraction form
   128,359.59/177,135.43 = 70,997.88/x
3. Step 3: Cross multiply
   128,359.59x = 177,135.43 × 70,997.88
4. Step 4: Simplify right side
   128,359.59x = 12,576,240,002.89
5. Step 5: Solve for x
   x = 12,576,240,002.89/128,359.59
6. Step 6: Final answer
   x = 97,976.63