Finding the Fourth Proportional to 111,138.30, 153,361.14 and 65,808.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111,138.30 : 153,361.14 = 65,808.15 : x
2. Step 2: Convert to fraction form
   111,138.30/153,361.14 = 65,808.15/x
3. Step 3: Cross multiply
   111,138.30x = 153,361.14 × 65,808.15
4. Step 4: Simplify right side
   111,138.30x = 10,092,412,905.29
5. Step 5: Solve for x
   x = 10,092,412,905.29/111,138.30
6. Step 6: Final answer
   x = 90,809.50