Finding the Fourth Proportional to 1,407.90, 1,942.10 and 988.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.90 : 1,942.10 = 988.08 : x
2. Step 2: Convert to fraction form
   1,407.90/1,942.10 = 988.08/x
3. Step 3: Cross multiply
   1,407.90x = 1,942.10 × 988.08
4. Step 4: Simplify right side
   1,407.90x = 1,918,950.17
5. Step 5: Solve for x
   x = 1,918,950.17/1,407.90
6. Step 6: Final answer
   x = 1,362.99