Finding the Fourth Proportional to 28,145.79, 38,855.32 and 21,758.00

Step by Step Solution

1. Step 1: Write the proportion equation
   28,145.79 : 38,855.32 = 21,758.00 : x
2. Step 2: Convert to fraction form
   28,145.79/38,855.32 = 21,758.00/x
3. Step 3: Cross multiply
   28,145.79x = 38,855.32 × 21,758.00
4. Step 4: Simplify right side
   28,145.79x = 845,413,803.89
5. Step 5: Solve for x
   x = 845,413,803.89/28,145.79
6. Step 6: Final answer
   x = 30,036.95