Finding the Fourth Proportional to 334,722.78, 502,084.20 and 85,404.78

Step by Step Solution

1. Step 1: Write the proportion equation
   334,722.78 : 502,084.20 = 85,404.78 : x
2. Step 2: Convert to fraction form
   334,722.78/502,084.20 = 85,404.78/x
3. Step 3: Cross multiply
   334,722.78x = 502,084.20 × 85,404.78
4. Step 4: Simplify right side
   334,722.78x = 42,880,390,642.48
5. Step 5: Solve for x
   x = 42,880,390,642.48/334,722.78
6. Step 6: Final answer
   x = 128,107.18