Finding the Fourth Proportional to 56,871, 78,484.41 and 31,720.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,871 : 78,484.41 = 31,720.50 : x
2. Step 2: Convert to fraction form
   56,871/78,484.41 = 31,720.50/x
3. Step 3: Cross multiply
   56,871x = 78,484.41 × 31,720.50
4. Step 4: Simplify right side
   56,871x = 2,489,564,727.41
5. Step 5: Solve for x
   x = 2,489,564,727.41/56,871
6. Step 6: Final answer
   x = 43,775.65