Finding the Fourth Proportional to 1,389,445.84, 1,917,795.72 and 786,183.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389,445.84 : 1,917,795.72 = 786,183.76 : x
2. Step 2: Convert to fraction form
   1,389,445.84/1,917,795.72 = 786,183.76/x
3. Step 3: Cross multiply
   1,389,445.84x = 1,917,795.72 × 786,183.76
4. Step 4: Simplify right side
   1,389,445.84x = 1,507,739,850,061.51
5. Step 5: Solve for x
   x = 1,507,739,850,061.51/1,389,445.84
6. Step 6: Final answer
   x = 1,085,137.55