Finding the Fourth Proportional to 42,120.19, 58,078.47 and 34,439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,120.19 : 58,078.47 = 34,439.50 : x
2. Step 2: Convert to fraction form
   42,120.19/58,078.47 = 34,439.50/x
3. Step 3: Cross multiply
   42,120.19x = 58,078.47 × 34,439.50
4. Step 4: Simplify right side
   42,120.19x = 2,000,193,467.57
5. Step 5: Solve for x
   x = 2,000,193,467.57/42,120.19
6. Step 6: Final answer
   x = 47,487.76