Finding the Fourth Proportional to 42,773.52, 64,152.08 and 13,186.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,773.52 : 64,152.08 = 13,186.88 : x
2. Step 2: Convert to fraction form
   42,773.52/64,152.08 = 13,186.88/x
3. Step 3: Cross multiply
   42,773.52x = 64,152.08 × 13,186.88
4. Step 4: Simplify right side
   42,773.52x = 845,965,780.71
5. Step 5: Solve for x
   x = 845,965,780.71/42,773.52
6. Step 6: Final answer
   x = 19,777.79