Finding the Fourth Proportional to 31,071.78, 42,907.41 and 19,913.22

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.78 : 42,907.41 = 19,913.22 : x
2. Step 2: Convert to fraction form
   31,071.78/42,907.41 = 19,913.22/x
3. Step 3: Cross multiply
   31,071.78x = 42,907.41 × 19,913.22
4. Step 4: Simplify right side
   31,071.78x = 854,424,694.96
5. Step 5: Solve for x
   x = 854,424,694.96/31,071.78
6. Step 6: Final answer
   x = 27,498.41