Finding the Fourth Proportional to 56,871.04, 78,483.72 and 31,720

Step by Step Solution

1. Step 1: Write the proportion equation
   56,871.04 : 78,483.72 = 31,720 : x
2. Step 2: Convert to fraction form
   56,871.04/78,483.72 = 31,720/x
3. Step 3: Cross multiply
   56,871.04x = 78,483.72 × 31,720
4. Step 4: Simplify right side
   56,871.04x = 2,489,503,598.40
5. Step 5: Solve for x
   x = 2,489,503,598.40/56,871.04
6. Step 6: Final answer
   x = 43,774.54