Finding the Fourth Proportional to 1,664,986.86, 2,490,361.47 and 1,389,758.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,664,986.86 : 2,490,361.47 = 1,389,758.31 : x
2. Step 2: Convert to fraction form
   1,664,986.86/2,490,361.47 = 1,389,758.31/x
3. Step 3: Cross multiply
   1,664,986.86x = 2,490,361.47 × 1,389,758.31
4. Step 4: Simplify right side
   1,664,986.86x = 3,461,000,547,836.32
5. Step 5: Solve for x
   x = 3,461,000,547,836.32/1,664,986.86
6. Step 6: Final answer
   x = 2,078,695.41