Finding the Fourth Proportional to 2,990.32, 4,485.60 and 1,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.32 : 4,485.60 = 1,042.72 : x
2. Step 2: Convert to fraction form
   2,990.32/4,485.60 = 1,042.72/x
3. Step 3: Cross multiply
   2,990.32x = 4,485.60 × 1,042.72
4. Step 4: Simplify right side
   2,990.32x = 4,677,224.83
5. Step 5: Solve for x
   x = 4,677,224.83/2,990.32
6. Step 6: Final answer
   x = 1,564.12