Finding the Fourth Proportional to 2,072.30, 2,858.32 and 1,407.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.30 : 2,858.32 = 1,407.99 : x
2. Step 2: Convert to fraction form
   2,072.30/2,858.32 = 1,407.99/x
3. Step 3: Cross multiply
   2,072.30x = 2,858.32 × 1,407.99
4. Step 4: Simplify right side
   2,072.30x = 4,024,498.46
5. Step 5: Solve for x
   x = 4,024,498.46/2,072.30
6. Step 6: Final answer
   x = 1,942.05