Finding the Fourth Proportional to 1,387,025.15, 1,913,554.02 and 870,477.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,025.15 : 1,913,554.02 = 870,477.62 : x
2. Step 2: Convert to fraction form
   1,387,025.15/1,913,554.02 = 870,477.62/x
3. Step 3: Cross multiply
   1,387,025.15x = 1,913,554.02 × 870,477.62
4. Step 4: Simplify right side
   1,387,025.15x = 1,665,705,949,071.03
5. Step 5: Solve for x
   x = 1,665,705,949,071.03/1,387,025.15
6. Step 6: Final answer
   x = 1,200,919.79