Finding the Fourth Proportional to 1,152,315.72, 1,590,246.54 and 643,020.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152,315.72 : 1,590,246.54 = 643,020.12 : x
2. Step 2: Convert to fraction form
   1,152,315.72/1,590,246.54 = 643,020.12/x
3. Step 3: Cross multiply
   1,152,315.72x = 1,590,246.54 × 643,020.12
4. Step 4: Simplify right side
   1,152,315.72x = 1,022,560,520,980.38
5. Step 5: Solve for x
   x = 1,022,560,520,980.38/1,152,315.72
6. Step 6: Final answer
   x = 887,396.14