Finding the Fourth Proportional to 49,128.06, 73,630.47 and 21,015.12

Step by Step Solution

1. Step 1: Write the proportion equation
   49,128.06 : 73,630.47 = 21,015.12 : x
2. Step 2: Convert to fraction form
   49,128.06/73,630.47 = 21,015.12/x
3. Step 3: Cross multiply
   49,128.06x = 73,630.47 × 21,015.12
4. Step 4: Simplify right side
   49,128.06x = 1,547,353,162.71
5. Step 5: Solve for x
   x = 1,547,353,162.71/49,128.06
6. Step 6: Final answer
   x = 31,496.32