Finding the Fourth Proportional to 128,245.91, 176,978.39 and 70,889.00

Step by Step Solution

1. Step 1: Write the proportion equation
   128,245.91 : 176,978.39 = 70,889.00 : x
2. Step 2: Convert to fraction form
   128,245.91/176,978.39 = 70,889.00/x
3. Step 3: Cross multiply
   128,245.91x = 176,978.39 × 70,889.00
4. Step 4: Simplify right side
   128,245.91x = 12,545,819,849.37
5. Step 5: Solve for x
   x = 12,545,819,849.37/128,245.91
6. Step 6: Final answer
   x = 97,826.28