Finding the Fourth Proportional to 61,490.34, 84,678.01 and 53,420.31

Step by Step Solution

1. Step 1: Write the proportion equation
   61,490.34 : 84,678.01 = 53,420.31 : x
2. Step 2: Convert to fraction form
   61,490.34/84,678.01 = 53,420.31/x
3. Step 3: Cross multiply
   61,490.34x = 84,678.01 × 53,420.31
4. Step 4: Simplify right side
   61,490.34x = 4,523,525,410.83
5. Step 5: Solve for x
   x = 4,523,525,410.83/61,490.34
6. Step 6: Final answer
   x = 73,564.81