Finding the Fourth Proportional to 56,870.36, 78,480.90 and 31,719.84

Step by Step Solution

1. Step 1: Write the proportion equation
   56,870.36 : 78,480.90 = 31,719.84 : x
2. Step 2: Convert to fraction form
   56,870.36/78,480.90 = 31,719.84/x
3. Step 3: Cross multiply
   56,870.36x = 78,480.90 × 31,719.84
4. Step 4: Simplify right side
   56,870.36x = 2,489,401,591.06
5. Step 5: Solve for x
   x = 2,489,401,591.06/56,870.36
6. Step 6: Final answer
   x = 43,773.27