Finding the Fourth Proportional to 42,770.93, 64,164.94 and 13,187.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,770.93 : 64,164.94 = 13,187.64 : x
2. Step 2: Convert to fraction form
   42,770.93/64,164.94 = 13,187.64/x
3. Step 3: Cross multiply
   42,770.93x = 64,164.94 × 13,187.64
4. Step 4: Simplify right side
   42,770.93x = 846,184,096.37
5. Step 5: Solve for x
   x = 846,184,096.37/42,770.93
6. Step 6: Final answer
   x = 19,784.09