Finding the Fourth Proportional to 98,665.98, 136,068.20 and 64,662.08

Step by Step Solution

1. Step 1: Write the proportion equation
   98,665.98 : 136,068.20 = 64,662.08 : x
2. Step 2: Convert to fraction form
   98,665.98/136,068.20 = 64,662.08/x
3. Step 3: Cross multiply
   98,665.98x = 136,068.20 × 64,662.08
4. Step 4: Simplify right side
   98,665.98x = 8,798,452,170.38
5. Step 5: Solve for x
   x = 8,798,452,170.38/98,665.98
6. Step 6: Final answer
   x = 89,174.12