Finding the Fourth Proportional to 42,855.84, 64,300.68 and 13,275.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,855.84 : 64,300.68 = 13,275.98 : x
2. Step 2: Convert to fraction form
   42,855.84/64,300.68 = 13,275.98/x
3. Step 3: Cross multiply
   42,855.84x = 64,300.68 × 13,275.98
4. Step 4: Simplify right side
   42,855.84x = 853,654,702.42
5. Step 5: Solve for x
   x = 853,654,702.42/42,855.84
6. Step 6: Final answer
   x = 19,919.22