Finding the Fourth Proportional to 56,121.31, 77,446.72 and 30,628.10

Step by Step Solution

1. Step 1: Write the proportion equation
   56,121.31 : 77,446.72 = 30,628.10 : x
2. Step 2: Convert to fraction form
   56,121.31/77,446.72 = 30,628.10/x
3. Step 3: Cross multiply
   56,121.31x = 77,446.72 × 30,628.10
4. Step 4: Simplify right side
   56,121.31x = 2,372,045,855.84
5. Step 5: Solve for x
   x = 2,372,045,855.84/56,121.31
6. Step 6: Final answer
   x = 42,266.41