Finding the Fourth Proportional to 103,856.56, 143,321.86 and 56,109.76

Step by Step Solution

1. Step 1: Write the proportion equation
   103,856.56 : 143,321.86 = 56,109.76 : x
2. Step 2: Convert to fraction form
   103,856.56/143,321.86 = 56,109.76/x
3. Step 3: Cross multiply
   103,856.56x = 143,321.86 × 56,109.76
4. Step 4: Simplify right side
   103,856.56x = 8,041,755,167.35
5. Step 5: Solve for x
   x = 8,041,755,167.35/103,856.56
6. Step 6: Final answer
   x = 77,431.36