Finding the Fourth Proportional to 42,756.30, 64,134.42 and 11,591.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42,756.30 : 64,134.42 = 11,591.55 : x
2. Step 2: Convert to fraction form
   42,756.30/64,134.42 = 11,591.55/x
3. Step 3: Cross multiply
   42,756.30x = 64,134.42 × 11,591.55
4. Step 4: Simplify right side
   42,756.30x = 743,417,336.15
5. Step 5: Solve for x
   x = 743,417,336.15/42,756.30
6. Step 6: Final answer
   x = 17,387.32