Finding the Fourth Proportional to 42,735.50, 64,111.76 and 13,152.21

Step by Step Solution

1. Step 1: Write the proportion equation
   42,735.50 : 64,111.76 = 13,152.21 : x
2. Step 2: Convert to fraction form
   42,735.50/64,111.76 = 13,152.21/x
3. Step 3: Cross multiply
   42,735.50x = 64,111.76 × 13,152.21
4. Step 4: Simplify right side
   42,735.50x = 843,211,265.23
5. Step 5: Solve for x
   x = 843,211,265.23/42,735.50
6. Step 6: Final answer
   x = 19,730.93