Finding the Fourth Proportional to 2,812.31, 4,219.05 and 1,407.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,812.31 : 4,219.05 = 1,407.46 : x
2. Step 2: Convert to fraction form
   2,812.31/4,219.05 = 1,407.46/x
3. Step 3: Cross multiply
   2,812.31x = 4,219.05 × 1,407.46
4. Step 4: Simplify right side
   2,812.31x = 5,938,128.29
5. Step 5: Solve for x
   x = 5,938,128.29/2,812.31
6. Step 6: Final answer
   x = 2,111.48