Finding the Fourth Proportional to 31,071.19, 42,868.02 and 18,147.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.19 : 42,868.02 = 18,147.50 : x
2. Step 2: Convert to fraction form
   31,071.19/42,868.02 = 18,147.50/x
3. Step 3: Cross multiply
   31,071.19x = 42,868.02 × 18,147.50
4. Step 4: Simplify right side
   31,071.19x = 777,947,087.87
5. Step 5: Solve for x
   x = 777,947,087.87/31,071.19
6. Step 6: Final answer
   x = 25,037.57