Finding the Fourth Proportional to 1,225,513.91, 1,691,184.89 and 681,638.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225,513.91 : 1,691,184.89 = 681,638.00 : x
2. Step 2: Convert to fraction form
   1,225,513.91/1,691,184.89 = 681,638.00/x
3. Step 3: Cross multiply
   1,225,513.91x = 1,691,184.89 × 681,638.00
4. Step 4: Simplify right side
   1,225,513.91x = 1,152,775,879,297.99
5. Step 5: Solve for x
   x = 1,152,775,879,297.99/1,225,513.91
6. Step 6: Final answer
   x = 940,646.91