Finding the Fourth Proportional to 28,088.50, 42,145.05 and 13,307.98

Step by Step Solution

1. Step 1: Write the proportion equation
   28,088.50 : 42,145.05 = 13,307.98 : x
2. Step 2: Convert to fraction form
   28,088.50/42,145.05 = 13,307.98/x
3. Step 3: Cross multiply
   28,088.50x = 42,145.05 × 13,307.98
4. Step 4: Simplify right side
   28,088.50x = 560,865,482.50
5. Step 5: Solve for x
   x = 560,865,482.50/28,088.50
6. Step 6: Final answer
   x = 19,967.80