Finding the Fourth Proportional to 128,978.02, 178,000.50 and 75,266.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,978.02 : 178,000.50 = 75,266.56 : x
2. Step 2: Convert to fraction form
   128,978.02/178,000.50 = 75,266.56/x
3. Step 3: Cross multiply
   128,978.02x = 178,000.50 × 75,266.56
4. Step 4: Simplify right side
   128,978.02x = 13,397,485,313.28
5. Step 5: Solve for x
   x = 13,397,485,313.28/128,978.02
6. Step 6: Final answer
   x = 103,874.17