Finding the Fourth Proportional to 31,010.72, 42,779.74 and 18,426.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,010.72 : 42,779.74 = 18,426.56 : x
2. Step 2: Convert to fraction form
   31,010.72/42,779.74 = 18,426.56/x
3. Step 3: Cross multiply
   31,010.72x = 42,779.74 × 18,426.56
4. Step 4: Simplify right side
   31,010.72x = 788,283,445.89
5. Step 5: Solve for x
   x = 788,283,445.89/31,010.72
6. Step 6: Final answer
   x = 25,419.71