Finding the Fourth Proportional to 28,644.84, 42,970.50 and 13,066.92

Step by Step Solution

1. Step 1: Write the proportion equation
   28,644.84 : 42,970.50 = 13,066.92 : x
2. Step 2: Convert to fraction form
   28,644.84/42,970.50 = 13,066.92/x
3. Step 3: Cross multiply
   28,644.84x = 42,970.50 × 13,066.92
4. Step 4: Simplify right side
   28,644.84x = 561,492,085.86
5. Step 5: Solve for x
   x = 561,492,085.86/28,644.84
6. Step 6: Final answer
   x = 19,601.86