Finding the Fourth Proportional to 42,766.82, 64,156.17 and 13,186.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,766.82 : 64,156.17 = 13,186.98 : x
2. Step 2: Convert to fraction form
   42,766.82/64,156.17 = 13,186.98/x
3. Step 3: Cross multiply
   42,766.82x = 64,156.17 × 13,186.98
4. Step 4: Simplify right side
   42,766.82x = 846,026,130.67
5. Step 5: Solve for x
   x = 846,026,130.67/42,766.82
6. Step 6: Final answer
   x = 19,782.30