Finding the Fourth Proportional to 1,435.61, 1,980.84 and 938.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.61 : 1,980.84 = 938.98 : x
2. Step 2: Convert to fraction form
   1,435.61/1,980.84 = 938.98/x
3. Step 3: Cross multiply
   1,435.61x = 1,980.84 × 938.98
4. Step 4: Simplify right side
   1,435.61x = 1,859,969.14
5. Step 5: Solve for x
   x = 1,859,969.14/1,435.61
6. Step 6: Final answer
   x = 1,295.60