Finding the Fourth Proportional to 313,012.78, 469,538.18 and 88,390.15

Step by Step Solution

1. Step 1: Write the proportion equation
   313,012.78 : 469,538.18 = 88,390.15 : x
2. Step 2: Convert to fraction form
   313,012.78/469,538.18 = 88,390.15/x
3. Step 3: Cross multiply
   313,012.78x = 469,538.18 × 88,390.15
4. Step 4: Simplify right side
   313,012.78x = 41,502,550,160.93
5. Step 5: Solve for x
   x = 41,502,550,160.93/313,012.78
6. Step 6: Final answer
   x = 132,590.59