Finding the Fourth Proportional to 56,143.50, 77,478.18 and 30,993

Step by Step Solution

1. Step 1: Write the proportion equation
   56,143.50 : 77,478.18 = 30,993 : x
2. Step 2: Convert to fraction form
   56,143.50/77,478.18 = 30,993/x
3. Step 3: Cross multiply
   56,143.50x = 77,478.18 × 30,993
4. Step 4: Simplify right side
   56,143.50x = 2,401,281,232.74
5. Step 5: Solve for x
   x = 2,401,281,232.74/56,143.50
6. Step 6: Final answer
   x = 42,770.42