Finding the Fourth Proportional to 42,866, 64,299 and 19,499.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,866 : 64,299 = 19,499.12 : x
2. Step 2: Convert to fraction form
   42,866/64,299 = 19,499.12/x
3. Step 3: Cross multiply
   42,866x = 64,299 × 19,499.12
4. Step 4: Simplify right side
   42,866x = 1,253,773,916.88
5. Step 5: Solve for x
   x = 1,253,773,916.88/42,866
6. Step 6: Final answer
   x = 29,248.68