Finding the Fourth Proportional to 56,140.56, 77,474.04 and 30,990.06

Step by Step Solution

1. Step 1: Write the proportion equation
   56,140.56 : 77,474.04 = 30,990.06 : x
2. Step 2: Convert to fraction form
   56,140.56/77,474.04 = 30,990.06/x
3. Step 3: Cross multiply
   56,140.56x = 77,474.04 × 30,990.06
4. Step 4: Simplify right side
   56,140.56x = 2,400,925,148.04
5. Step 5: Solve for x
   x = 2,400,925,148.04/56,140.56
6. Step 6: Final answer
   x = 42,766.32