Finding the Fourth Proportional to 1,274,522.31, 1,911,328.04 and 421,436.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,274,522.31 : 1,911,328.04 = 421,436.39 : x
2. Step 2: Convert to fraction form
   1,274,522.31/1,911,328.04 = 421,436.39/x
3. Step 3: Cross multiply
   1,274,522.31x = 1,911,328.04 × 421,436.39
4. Step 4: Simplify right side
   1,274,522.31x = 805,503,180,780.33
5. Step 5: Solve for x
   x = 805,503,180,780.33/1,274,522.31
6. Step 6: Final answer
   x = 632,003.99