Finding the Fourth Proportional to 85,417.07, 128,141.12 and 42,744.78

Step by Step Solution

1. Step 1: Write the proportion equation
   85,417.07 : 128,141.12 = 42,744.78 : x
2. Step 2: Convert to fraction form
   85,417.07/128,141.12 = 42,744.78/x
3. Step 3: Cross multiply
   85,417.07x = 128,141.12 × 42,744.78
4. Step 4: Simplify right side
   85,417.07x = 5,477,364,090.22
5. Step 5: Solve for x
   x = 5,477,364,090.22/85,417.07
6. Step 6: Final answer
   x = 64,124.94