Finding the Fourth Proportional to 39,404.60, 54,378.52 and 21,499.98

Step by Step Solution

1. Step 1: Write the proportion equation
   39,404.60 : 54,378.52 = 21,499.98 : x
2. Step 2: Convert to fraction form
   39,404.60/54,378.52 = 21,499.98/x
3. Step 3: Cross multiply
   39,404.60x = 54,378.52 × 21,499.98
4. Step 4: Simplify right side
   39,404.60x = 1,169,136,834.76
5. Step 5: Solve for x
   x = 1,169,136,834.76/39,404.60
6. Step 6: Final answer
   x = 29,670.06