Finding the Fourth Proportional to 1,272,857.86, 1,756,606.90 and 789,578.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272,857.86 : 1,756,606.90 = 789,578.72 : x
2. Step 2: Convert to fraction form
   1,272,857.86/1,756,606.90 = 789,578.72/x
3. Step 3: Cross multiply
   1,272,857.86x = 1,756,606.90 × 789,578.72
4. Step 4: Simplify right side
   1,272,857.86x = 1,386,979,427,645.17
5. Step 5: Solve for x
   x = 1,386,979,427,645.17/1,272,857.86
6. Step 6: Final answer
   x = 1,089,657.75