Finding the Fourth Proportional to 116,309.28, 174,515.76 and 42,420

Step by Step Solution

1. Step 1: Write the proportion equation
   116,309.28 : 174,515.76 = 42,420 : x
2. Step 2: Convert to fraction form
   116,309.28/174,515.76 = 42,420/x
3. Step 3: Cross multiply
   116,309.28x = 174,515.76 × 42,420
4. Step 4: Simplify right side
   116,309.28x = 7,402,958,539.20
5. Step 5: Solve for x
   x = 7,402,958,539.20/116,309.28
6. Step 6: Final answer
   x = 63,648.91