Finding the Fourth Proportional to 1,361.21, 1,878.72 and 837.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.21 : 1,878.72 = 837.50 : x
2. Step 2: Convert to fraction form
   1,361.21/1,878.72 = 837.50/x
3. Step 3: Cross multiply
   1,361.21x = 1,878.72 × 837.50
4. Step 4: Simplify right side
   1,361.21x = 1,573,428
5. Step 5: Solve for x
   x = 1,573,428/1,361.21
6. Step 6: Final answer
   x = 1,155.90