Finding the Fourth Proportional to 55,572, 76,689.42 and 30,421.56

Step by Step Solution

1. Step 1: Write the proportion equation
   55,572 : 76,689.42 = 30,421.56 : x
2. Step 2: Convert to fraction form
   55,572/76,689.42 = 30,421.56/x
3. Step 3: Cross multiply
   55,572x = 76,689.42 × 30,421.56
4. Step 4: Simplify right side
   55,572x = 2,333,011,791.90
5. Step 5: Solve for x
   x = 2,333,011,791.90/55,572
6. Step 6: Final answer
   x = 41,981.79