Finding the Fourth Proportional to 66,065.28, 91,139.76 and 42,180

Step by Step Solution

1. Step 1: Write the proportion equation
   66,065.28 : 91,139.76 = 42,180 : x
2. Step 2: Convert to fraction form
   66,065.28/91,139.76 = 42,180/x
3. Step 3: Cross multiply
   66,065.28x = 91,139.76 × 42,180
4. Step 4: Simplify right side
   66,065.28x = 3,844,275,076.80
5. Step 5: Solve for x
   x = 3,844,275,076.80/66,065.28
6. Step 6: Final answer
   x = 58,189.04