Finding the Fourth Proportional to 102,196.21, 141,037.40 and 56,874.05

Step by Step Solution

1. Step 1: Write the proportion equation
   102,196.21 : 141,037.40 = 56,874.05 : x
2. Step 2: Convert to fraction form
   102,196.21/141,037.40 = 56,874.05/x
3. Step 3: Cross multiply
   102,196.21x = 141,037.40 × 56,874.05
4. Step 4: Simplify right side
   102,196.21x = 8,021,368,578.78
5. Step 5: Solve for x
   x = 8,021,368,578.78/102,196.21
6. Step 6: Final answer
   x = 78,489.88