Finding the Fourth Proportional to 84,406.50, 126,415.89 and 42,156.90

Step by Step Solution

1. Step 1: Write the proportion equation
   84,406.50 : 126,415.89 = 42,156.90 : x
2. Step 2: Convert to fraction form
   84,406.50/126,415.89 = 42,156.90/x
3. Step 3: Cross multiply
   84,406.50x = 126,415.89 × 42,156.90
4. Step 4: Simplify right side
   84,406.50x = 5,329,302,033.14
5. Step 5: Solve for x
   x = 5,329,302,033.14/84,406.50
6. Step 6: Final answer
   x = 63,138.53