Finding the Fourth Proportional to 99,801.35, 137,748.99 and 65,815.98

Step by Step Solution

1. Step 1: Write the proportion equation
   99,801.35 : 137,748.99 = 65,815.98 : x
2. Step 2: Convert to fraction form
   99,801.35/137,748.99 = 65,815.98/x
3. Step 3: Cross multiply
   99,801.35x = 137,748.99 × 65,815.98
4. Step 4: Simplify right side
   99,801.35x = 9,066,084,770.86
5. Step 5: Solve for x
   x = 9,066,084,770.86/99,801.35
6. Step 6: Final answer
   x = 90,841.30