Finding the Fourth Proportional to 42,892.40, 64,344.82 and 13,312.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,892.40 : 64,344.82 = 13,312.62 : x
2. Step 2: Convert to fraction form
   42,892.40/64,344.82 = 13,312.62/x
3. Step 3: Cross multiply
   42,892.40x = 64,344.82 × 13,312.62
4. Step 4: Simplify right side
   42,892.40x = 856,598,137.63
5. Step 5: Solve for x
   x = 856,598,137.63/42,892.40
6. Step 6: Final answer
   x = 19,970.86