Finding the Fourth Proportional to 40,837.89, 61,243.88 and 13,129.41

Step by Step Solution

1. Step 1: Write the proportion equation
   40,837.89 : 61,243.88 = 13,129.41 : x
2. Step 2: Convert to fraction form
   40,837.89/61,243.88 = 13,129.41/x
3. Step 3: Cross multiply
   40,837.89x = 61,243.88 × 13,129.41
4. Step 4: Simplify right side
   40,837.89x = 804,095,944.86
5. Step 5: Solve for x
   x = 804,095,944.86/40,837.89
6. Step 6: Final answer
   x = 19,689.95