Finding the Fourth Proportional to 1,430.28, 1,973.76 and 906.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.28 : 1,973.76 = 906.30 : x
2. Step 2: Convert to fraction form
   1,430.28/1,973.76 = 906.30/x
3. Step 3: Cross multiply
   1,430.28x = 1,973.76 × 906.30
4. Step 4: Simplify right side
   1,430.28x = 1,788,818.69
5. Step 5: Solve for x
   x = 1,788,818.69/1,430.28
6. Step 6: Final answer
   x = 1,250.68