Finding the Fourth Proportional to 30,478.48, 42,063.30 and 19,156.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,478.48 : 42,063.30 = 19,156.50 : x
2. Step 2: Convert to fraction form
   30,478.48/42,063.30 = 19,156.50/x
3. Step 3: Cross multiply
   30,478.48x = 42,063.30 × 19,156.50
4. Step 4: Simplify right side
   30,478.48x = 805,785,606.45
5. Step 5: Solve for x
   x = 805,785,606.45/30,478.48
6. Step 6: Final answer
   x = 26,437.86