Finding the Fourth Proportional to 1,087,018.92, 1,637,038.69 and 990,054.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087,018.92 : 1,637,038.69 = 990,054.63 : x
2. Step 2: Convert to fraction form
   1,087,018.92/1,637,038.69 = 990,054.63/x
3. Step 3: Cross multiply
   1,087,018.92x = 1,637,038.69 × 990,054.63
4. Step 4: Simplify right side
   1,087,018.92x = 1,620,757,732,048.50
5. Step 5: Solve for x
   x = 1,620,757,732,048.50/1,087,018.92
6. Step 6: Final answer
   x = 1,491,011.52