Finding the Fourth Proportional to 13,100.51, 19,650.90 and 5,307.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,100.51 : 19,650.90 = 5,307.50 : x
2. Step 2: Convert to fraction form
   13,100.51/19,650.90 = 5,307.50/x
3. Step 3: Cross multiply
   13,100.51x = 19,650.90 × 5,307.50
4. Step 4: Simplify right side
   13,100.51x = 104,297,151.75
5. Step 5: Solve for x
   x = 104,297,151.75/13,100.51
6. Step 6: Final answer
   x = 7,961.30