Finding the Fourth Proportional to 99,485.50, 137,406.63 and 65,893.18

Step by Step Solution

1. Step 1: Write the proportion equation
   99,485.50 : 137,406.63 = 65,893.18 : x
2. Step 2: Convert to fraction form
   99,485.50/137,406.63 = 65,893.18/x
3. Step 3: Cross multiply
   99,485.50x = 137,406.63 × 65,893.18
4. Step 4: Simplify right side
   99,485.50x = 9,054,159,803.78
5. Step 5: Solve for x
   x = 9,054,159,803.78/99,485.50
6. Step 6: Final answer
   x = 91,009.84