Finding the Fourth Proportional to 1,430.31, 1,973.55 and 988.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.31 : 1,973.55 = 988.05 : x
2. Step 2: Convert to fraction form
   1,430.31/1,973.55 = 988.05/x
3. Step 3: Cross multiply
   1,430.31x = 1,973.55 × 988.05
4. Step 4: Simplify right side
   1,430.31x = 1,949,966.08
5. Step 5: Solve for x
   x = 1,949,966.08/1,430.31
6. Step 6: Final answer
   x = 1,363.32