Finding the Fourth Proportional to 5,290.38, 7,300.80 and 2,900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,290.38 : 7,300.80 = 2,900.30 : x
2. Step 2: Convert to fraction form
   5,290.38/7,300.80 = 2,900.30/x
3. Step 3: Cross multiply
   5,290.38x = 7,300.80 × 2,900.30
4. Step 4: Simplify right side
   5,290.38x = 21,174,473.74
5. Step 5: Solve for x
   x = 21,174,473.74/5,290.38
6. Step 6: Final answer
   x = 4,002.45