Finding the Fourth Proportional to 1,152,638.58, 1,590,494.49 and 643,362.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152,638.58 : 1,590,494.49 = 643,362.42 : x
2. Step 2: Convert to fraction form
   1,152,638.58/1,590,494.49 = 643,362.42/x
3. Step 3: Cross multiply
   1,152,638.58x = 1,590,494.49 × 643,362.42
4. Step 4: Simplify right side
   1,152,638.58x = 1,023,264,384,083.07
5. Step 5: Solve for x
   x = 1,023,264,384,083.07/1,152,638.58
6. Step 6: Final answer
   x = 887,758.23