Finding the Fourth Proportional to 155,890.24, 215,076 and 88,774.72

Step by Step Solution

1. Step 1: Write the proportion equation
   155,890.24 : 215,076 = 88,774.72 : x
2. Step 2: Convert to fraction form
   155,890.24/215,076 = 88,774.72/x
3. Step 3: Cross multiply
   155,890.24x = 215,076 × 88,774.72
4. Step 4: Simplify right side
   155,890.24x = 19,093,311,678.72
5. Step 5: Solve for x
   x = 19,093,311,678.72/155,890.24
6. Step 6: Final answer
   x = 122,479.20