Finding the Fourth Proportional to 2,131.59, 2,941.58 and 1,187.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.59 : 2,941.58 = 1,187.42 : x
2. Step 2: Convert to fraction form
   2,131.59/2,941.58 = 1,187.42/x
3. Step 3: Cross multiply
   2,131.59x = 2,941.58 × 1,187.42
4. Step 4: Simplify right side
   2,131.59x = 3,492,901.25
5. Step 5: Solve for x
   x = 3,492,901.25/2,131.59
6. Step 6: Final answer
   x = 1,638.64