Finding the Fourth Proportional to 19,158.50, 28,737.75 and 5,307.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,158.50 : 28,737.75 = 5,307.50 : x
2. Step 2: Convert to fraction form
   19,158.50/28,737.75 = 5,307.50/x
3. Step 3: Cross multiply
   19,158.50x = 28,737.75 × 5,307.50
4. Step 4: Simplify right side
   19,158.50x = 152,525,484.34
5. Step 5: Solve for x
   x = 152,525,484.34/19,158.50
6. Step 6: Final answer
   x = 7,961.25