Finding the Fourth Proportional to 61,006.72, 91,390.88 and 42,028

Step by Step Solution

1. Step 1: Write the proportion equation
   61,006.72 : 91,390.88 = 42,028 : x
2. Step 2: Convert to fraction form
   61,006.72/91,390.88 = 42,028/x
3. Step 3: Cross multiply
   61,006.72x = 91,390.88 × 42,028
4. Step 4: Simplify right side
   61,006.72x = 3,840,975,904.64
5. Step 5: Solve for x
   x = 3,840,975,904.64/61,006.72
6. Step 6: Final answer
   x = 62,959.88