Finding the Fourth Proportional to 1,430.68, 1,973.92 and 987.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.68 : 1,973.92 = 987.88 : x
2. Step 2: Convert to fraction form
   1,430.68/1,973.92 = 987.88/x
3. Step 3: Cross multiply
   1,430.68x = 1,973.92 × 987.88
4. Step 4: Simplify right side
   1,430.68x = 1,949,996.09
5. Step 5: Solve for x
   x = 1,949,996.09/1,430.68
6. Step 6: Final answer
   x = 1,362.99