Finding the Fourth Proportional to 1,019.71, 1,528.63 and 370.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.71 : 1,528.63 = 370.30 : x
2. Step 2: Convert to fraction form
   1,019.71/1,528.63 = 370.30/x
3. Step 3: Cross multiply
   1,019.71x = 1,528.63 × 370.30
4. Step 4: Simplify right side
   1,019.71x = 566,051.69
5. Step 5: Solve for x
   x = 566,051.69/1,019.71
6. Step 6: Final answer
   x = 555.11