Finding the Fourth Proportional to 423,602.98, 635,404.71 and 265,942.15

Step by Step Solution

1. Step 1: Write the proportion equation
   423,602.98 : 635,404.71 = 265,942.15 : x
2. Step 2: Convert to fraction form
   423,602.98/635,404.71 = 265,942.15/x
3. Step 3: Cross multiply
   423,602.98x = 635,404.71 × 265,942.15
4. Step 4: Simplify right side
   423,602.98x = 168,980,894,697.53
5. Step 5: Solve for x
   x = 168,980,894,697.53/423,602.98
6. Step 6: Final answer
   x = 398,913.38