Finding the Fourth Proportional to 102,692.98, 141,514.42 and 78,521.31

Step by Step Solution

1. Step 1: Write the proportion equation
   102,692.98 : 141,514.42 = 78,521.31 : x
2. Step 2: Convert to fraction form
   102,692.98/141,514.42 = 78,521.31/x
3. Step 3: Cross multiply
   102,692.98x = 141,514.42 × 78,521.31
4. Step 4: Simplify right side
   102,692.98x = 11,111,897,642.29
5. Step 5: Solve for x
   x = 11,111,897,642.29/102,692.98
6. Step 6: Final answer
   x = 108,205.04