Finding the Fourth Proportional to 42,978.18, 64,455.87 and 30,461.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.18 : 64,455.87 = 30,461.25 : x
2. Step 2: Convert to fraction form
   42,978.18/64,455.87 = 30,461.25/x
3. Step 3: Cross multiply
   42,978.18x = 64,455.87 × 30,461.25
4. Step 4: Simplify right side
   42,978.18x = 1,963,406,370.04
5. Step 5: Solve for x
   x = 1,963,406,370.04/42,978.18
6. Step 6: Final answer
   x = 45,683.80