Finding the Fourth Proportional to 38,500.89, 53,129.55 and 21,507.09

Step by Step Solution

1. Step 1: Write the proportion equation
   38,500.89 : 53,129.55 = 21,507.09 : x
2. Step 2: Convert to fraction form
   38,500.89/53,129.55 = 21,507.09/x
3. Step 3: Cross multiply
   38,500.89x = 53,129.55 × 21,507.09
4. Step 4: Simplify right side
   38,500.89x = 1,142,662,013.51
5. Step 5: Solve for x
   x = 1,142,662,013.51/38,500.89
6. Step 6: Final answer
   x = 29,678.85