Finding the Fourth Proportional to 2,990.39, 4,485.98 and 1,042.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.39 : 4,485.98 = 1,042.07 : x
2. Step 2: Convert to fraction form
   2,990.39/4,485.98 = 1,042.07/x
3. Step 3: Cross multiply
   2,990.39x = 4,485.98 × 1,042.07
4. Step 4: Simplify right side
   2,990.39x = 4,674,685.35
5. Step 5: Solve for x
   x = 4,674,685.35/2,990.39
6. Step 6: Final answer
   x = 1,563.24