Finding the Fourth Proportional to 19,994.74, 30,010.31 and 10,642.61

Step by Step Solution

1. Step 1: Write the proportion equation
   19,994.74 : 30,010.31 = 10,642.61 : x
2. Step 2: Convert to fraction form
   19,994.74/30,010.31 = 10,642.61/x
3. Step 3: Cross multiply
   19,994.74x = 30,010.31 × 10,642.61
4. Step 4: Simplify right side
   19,994.74x = 319,388,025.31
5. Step 5: Solve for x
   x = 319,388,025.31/19,994.74
6. Step 6: Final answer
   x = 15,973.60