Finding the Fourth Proportional to 42,928.04, 64,401.18 and 13,345.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,928.04 : 64,401.18 = 13,345.16 : x
2. Step 2: Convert to fraction form
   42,928.04/64,401.18 = 13,345.16/x
3. Step 3: Cross multiply
   42,928.04x = 64,401.18 × 13,345.16
4. Step 4: Simplify right side
   42,928.04x = 859,444,051.29
5. Step 5: Solve for x
   x = 859,444,051.29/42,928.04
6. Step 6: Final answer
   x = 20,020.58