Finding the Fourth Proportional to 2,087,789.86, 3,130,916.60 and 721,215.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087,789.86 : 3,130,916.60 = 721,215.90 : x
2. Step 2: Convert to fraction form
   2,087,789.86/3,130,916.60 = 721,215.90/x
3. Step 3: Cross multiply
   2,087,789.86x = 3,130,916.60 × 721,215.90
4. Step 4: Simplify right side
   2,087,789.86x = 2,258,066,833,493.94
5. Step 5: Solve for x
   x = 2,258,066,833,493.94/2,087,789.86
6. Step 6: Final answer
   x = 1,081,558.48