Finding the Fourth Proportional to 61,005.80, 84,128.86 and 47,572.16

Step by Step Solution

1. Step 1: Write the proportion equation
   61,005.80 : 84,128.86 = 47,572.16 : x
2. Step 2: Convert to fraction form
   61,005.80/84,128.86 = 47,572.16/x
3. Step 3: Cross multiply
   61,005.80x = 84,128.86 × 47,572.16
4. Step 4: Simplify right side
   61,005.80x = 4,002,191,167.89
5. Step 5: Solve for x
   x = 4,002,191,167.89/61,005.80
6. Step 6: Final answer
   x = 65,603.45