Finding the Fourth Proportional to 90,983.42, 136,371.60 and 55,366.18

Step by Step Solution

1. Step 1: Write the proportion equation
   90,983.42 : 136,371.60 = 55,366.18 : x
2. Step 2: Convert to fraction form
   90,983.42/136,371.60 = 55,366.18/x
3. Step 3: Cross multiply
   90,983.42x = 136,371.60 × 55,366.18
4. Step 4: Simplify right side
   90,983.42x = 7,550,374,978.65
5. Step 5: Solve for x
   x = 7,550,374,978.65/90,983.42
6. Step 6: Final answer
   x = 82,986.27