Finding the Fourth Proportional to 128,339.82, 177,107.38 and 70,978.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,339.82 : 177,107.38 = 70,978.10 : x
2. Step 2: Convert to fraction form
   128,339.82/177,107.38 = 70,978.10/x
3. Step 3: Cross multiply
   128,339.82x = 177,107.38 × 70,978.10
4. Step 4: Simplify right side
   128,339.82x = 12,570,744,913.23
5. Step 5: Solve for x
   x = 12,570,744,913.23/128,339.82
6. Step 6: Final answer
   x = 97,948.90