Finding the Fourth Proportional to 42,770.98, 64,152.35 and 13,180.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42,770.98 : 64,152.35 = 13,180.87 : x
2. Step 2: Convert to fraction form
   42,770.98/64,152.35 = 13,180.87/x
3. Step 3: Cross multiply
   42,770.98x = 64,152.35 × 13,180.87
4. Step 4: Simplify right side
   42,770.98x = 845,583,719.64
5. Step 5: Solve for x
   x = 845,583,719.64/42,770.98
6. Step 6: Final answer
   x = 19,770.03