Finding the Fourth Proportional to 56,139.60, 77,469.14 and 30,989.10

Step by Step Solution

1. Step 1: Write the proportion equation
   56,139.60 : 77,469.14 = 30,989.10 : x
2. Step 2: Convert to fraction form
   56,139.60/77,469.14 = 30,989.10/x
3. Step 3: Cross multiply
   56,139.60x = 77,469.14 × 30,989.10
4. Step 4: Simplify right side
   56,139.60x = 2,400,698,926.37
5. Step 5: Solve for x
   x = 2,400,698,926.37/56,139.60
6. Step 6: Final answer
   x = 42,763.02