Finding the Fourth Proportional to 221,088.78, 305,151.63 and 140,500.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,088.78 : 305,151.63 = 140,500.50 : x
2. Step 2: Convert to fraction form
   221,088.78/305,151.63 = 140,500.50/x
3. Step 3: Cross multiply
   221,088.78x = 305,151.63 × 140,500.50
4. Step 4: Simplify right side
   221,088.78x = 42,873,956,590.82
5. Step 5: Solve for x
   x = 42,873,956,590.82/221,088.78
6. Step 6: Final answer
   x = 193,921.90