Finding the Fourth Proportional to 1,290,006.91, 1,780,164.69 and 831,140.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,006.91 : 1,780,164.69 = 831,140.83 : x
2. Step 2: Convert to fraction form
   1,290,006.91/1,780,164.69 = 831,140.83/x
3. Step 3: Cross multiply
   1,290,006.91x = 1,780,164.69 × 831,140.83
4. Step 4: Simplify right side
   1,290,006.91x = 1,479,567,557,983.29
5. Step 5: Solve for x
   x = 1,479,567,557,983.29/1,290,006.91
6. Step 6: Final answer
   x = 1,146,945.45