Finding the Fourth Proportional to 85,422.72, 117,852.12 and 53,580

Step by Step Solution

1. Step 1: Write the proportion equation
   85,422.72 : 117,852.12 = 53,580 : x
2. Step 2: Convert to fraction form
   85,422.72/117,852.12 = 53,580/x
3. Step 3: Cross multiply
   85,422.72x = 117,852.12 × 53,580
4. Step 4: Simplify right side
   85,422.72x = 6,314,516,589.60
5. Step 5: Solve for x
   x = 6,314,516,589.60/85,422.72
6. Step 6: Final answer
   x = 73,920.81