Finding the Fourth Proportional to 660,395, 911,345.10 and 358,589

Step by Step Solution

1. Step 1: Write the proportion equation
   660,395 : 911,345.10 = 358,589 : x
2. Step 2: Convert to fraction form
   660,395/911,345.10 = 358,589/x
3. Step 3: Cross multiply
   660,395x = 911,345.10 × 358,589
4. Step 4: Simplify right side
   660,395x = 326,798,328,063.90
5. Step 5: Solve for x
   x = 326,798,328,063.90/660,395
6. Step 6: Final answer
   x = 494,852.82