Finding the Fourth Proportional to 81,155.98, 111,987.25 and 45,345.21

Step by Step Solution

1. Step 1: Write the proportion equation
   81,155.98 : 111,987.25 = 45,345.21 : x
2. Step 2: Convert to fraction form
   81,155.98/111,987.25 = 45,345.21/x
3. Step 3: Cross multiply
   81,155.98x = 111,987.25 × 45,345.21
4. Step 4: Simplify right side
   81,155.98x = 5,078,085,368.57
5. Step 5: Solve for x
   x = 5,078,085,368.57/81,155.98
6. Step 6: Final answer
   x = 62,571.92