Finding the Fourth Proportional to 2,590,938.16, 3,885,565.18 and 861,343.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590,938.16 : 3,885,565.18 = 861,343.72 : x
2. Step 2: Convert to fraction form
   2,590,938.16/3,885,565.18 = 861,343.72/x
3. Step 3: Cross multiply
   2,590,938.16x = 3,885,565.18 × 861,343.72
4. Step 4: Simplify right side
   2,590,938.16x = 3,346,807,166,443.67
5. Step 5: Solve for x
   x = 3,346,807,166,443.67/2,590,938.16
6. Step 6: Final answer
   x = 1,291,735.64