Finding the Fourth Proportional to 42,482.48, 63,719.60 and 12,900.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,482.48 : 63,719.60 = 12,900.56 : x
2. Step 2: Convert to fraction form
   42,482.48/63,719.60 = 12,900.56/x
3. Step 3: Cross multiply
   42,482.48x = 63,719.60 × 12,900.56
4. Step 4: Simplify right side
   42,482.48x = 822,018,522.98
5. Step 5: Solve for x
   x = 822,018,522.98/42,482.48
6. Step 6: Final answer
   x = 19,349.59