Finding the Fourth Proportional to 154,328.74, 212,979.72 and 90,665.98

Step by Step Solution

1. Step 1: Write the proportion equation
   154,328.74 : 212,979.72 = 90,665.98 : x
2. Step 2: Convert to fraction form
   154,328.74/212,979.72 = 90,665.98/x
3. Step 3: Cross multiply
   154,328.74x = 212,979.72 × 90,665.98
4. Step 4: Simplify right side
   154,328.74x = 19,310,015,033.93
5. Step 5: Solve for x
   x = 19,310,015,033.93/154,328.74
6. Step 6: Final answer
   x = 125,122.61