Finding the Fourth Proportional to 261,530.78, 391,921.88 and 148,978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   261,530.78 : 391,921.88 = 148,978.71 : x
2. Step 2: Convert to fraction form
   261,530.78/391,921.88 = 148,978.71/x
3. Step 3: Cross multiply
   261,530.78x = 391,921.88 × 148,978.71
4. Step 4: Simplify right side
   261,530.78x = 58,388,015,358.28
5. Step 5: Solve for x
   x = 58,388,015,358.28/261,530.78
6. Step 6: Final answer
   x = 223,254.86