Finding the Fourth Proportional to 1,188.59, 1,639.98 and 690.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188.59 : 1,639.98 = 690.93 : x
2. Step 2: Convert to fraction form
   1,188.59/1,639.98 = 690.93/x
3. Step 3: Cross multiply
   1,188.59x = 1,639.98 × 690.93
4. Step 4: Simplify right side
   1,188.59x = 1,133,111.38
5. Step 5: Solve for x
   x = 1,133,111.38/1,188.59
6. Step 6: Final answer
   x = 953.32