Finding the Fourth Proportional to 52,981.61, 79,472.48 and 13,538.76

Step by Step Solution

1. Step 1: Write the proportion equation
   52,981.61 : 79,472.48 = 13,538.76 : x
2. Step 2: Convert to fraction form
   52,981.61/79,472.48 = 13,538.76/x
3. Step 3: Cross multiply
   52,981.61x = 79,472.48 × 13,538.76
4. Step 4: Simplify right side
   52,981.61x = 1,075,958,467.61
5. Step 5: Solve for x
   x = 1,075,958,467.61/52,981.61
6. Step 6: Final answer
   x = 20,308.15