Finding the Fourth Proportional to 1,443,172.86, 1,991,789.79 and 831,207.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443,172.86 : 1,991,789.79 = 831,207.96 : x
2. Step 2: Convert to fraction form
   1,443,172.86/1,991,789.79 = 831,207.96/x
3. Step 3: Cross multiply
   1,443,172.86x = 1,991,789.79 × 831,207.96
4. Step 4: Simplify right side
   1,443,172.86x = 1,655,591,528,094.73
5. Step 5: Solve for x
   x = 1,655,591,528,094.73/1,443,172.86
6. Step 6: Final answer
   x = 1,147,188.65