Finding the Fourth Proportional to 85,498.74, 128,271.60 and 35,602.20

Step by Step Solution

1. Step 1: Write the proportion equation
   85,498.74 : 128,271.60 = 35,602.20 : x
2. Step 2: Convert to fraction form
   85,498.74/128,271.60 = 35,602.20/x
3. Step 3: Cross multiply
   85,498.74x = 128,271.60 × 35,602.20
4. Step 4: Simplify right side
   85,498.74x = 4,566,751,157.52
5. Step 5: Solve for x
   x = 4,566,751,157.52/85,498.74
6. Step 6: Final answer
   x = 53,413.08