Finding the Fourth Proportional to 31,069.98, 42,858.42 and 21,985.14

Step by Step Solution

1. Step 1: Write the proportion equation
   31,069.98 : 42,858.42 = 21,985.14 : x
2. Step 2: Convert to fraction form
   31,069.98/42,858.42 = 21,985.14/x
3. Step 3: Cross multiply
   31,069.98x = 42,858.42 × 21,985.14
4. Step 4: Simplify right side
   31,069.98x = 942,248,363.88
5. Step 5: Solve for x
   x = 942,248,363.88/31,069.98
6. Step 6: Final answer
   x = 30,326.65