Finding the Fourth Proportional to 85,111.48, 117,400.62 and 61,200.28

Step by Step Solution

1. Step 1: Write the proportion equation
   85,111.48 : 117,400.62 = 61,200.28 : x
2. Step 2: Convert to fraction form
   85,111.48/117,400.62 = 61,200.28/x
3. Step 3: Cross multiply
   85,111.48x = 117,400.62 × 61,200.28
4. Step 4: Simplify right side
   85,111.48x = 7,184,950,816.17
5. Step 5: Solve for x
   x = 7,184,950,816.17/85,111.48
6. Step 6: Final answer
   x = 84,418.12