Finding the Fourth Proportional to 12,961.78, 17,887.23 and 7,372.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.78 : 17,887.23 = 7,372.78 : x
2. Step 2: Convert to fraction form
   12,961.78/17,887.23 = 7,372.78/x
3. Step 3: Cross multiply
   12,961.78x = 17,887.23 × 7,372.78
4. Step 4: Simplify right side
   12,961.78x = 131,878,611.60
5. Step 5: Solve for x
   x = 131,878,611.60/12,961.78
6. Step 6: Final answer
   x = 10,174.42