Finding the Fourth Proportional to 69,126.72, 103,672.80 and 19,878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   69,126.72 : 103,672.80 = 19,878.72 : x
2. Step 2: Convert to fraction form
   69,126.72/103,672.80 = 19,878.72/x
3. Step 3: Cross multiply
   69,126.72x = 103,672.80 × 19,878.72
4. Step 4: Simplify right side
   69,126.72x = 2,060,882,562.82
5. Step 5: Solve for x
   x = 2,060,882,562.82/69,126.72
6. Step 6: Final answer
   x = 29,813.11