Finding the Fourth Proportional to 38,689,089.72, 53,390,942.07 and 21,285,061.29

Step by Step Solution

1. Step 1: Write the proportion equation
   38,689,089.72 : 53,390,942.07 = 21,285,061.29 : x
2. Step 2: Convert to fraction form
   38,689,089.72/53,390,942.07 = 21,285,061.29/x
3. Step 3: Cross multiply
   38,689,089.72x = 53,390,942.07 × 21,285,061.29
4. Step 4: Simplify right side
   38,689,089.72x = 1,136,429,474,290,789.50
5. Step 5: Solve for x
   x = 1,136,429,474,290,789.50/38,689,089.72
6. Step 6: Final answer
   x = 29,373,383.62