Finding the Fourth Proportional to 61,007.31, 91,391.76 and 42,028.59

Step by Step Solution

1. Step 1: Write the proportion equation
   61,007.31 : 91,391.76 = 42,028.59 : x
2. Step 2: Convert to fraction form
   61,007.31/91,391.76 = 42,028.59/x
3. Step 3: Cross multiply
   61,007.31x = 91,391.76 × 42,028.59
4. Step 4: Simplify right side
   61,007.31x = 3,841,066,810.42
5. Step 5: Solve for x
   x = 3,841,066,810.42/61,007.31
6. Step 6: Final answer
   x = 62,960.76