Finding the Fourth Proportional to 61,056.64, 91,427.24 and 42,139.67

Step by Step Solution

1. Step 1: Write the proportion equation
   61,056.64 : 91,427.24 = 42,139.67 : x
2. Step 2: Convert to fraction form
   61,056.64/91,427.24 = 42,139.67/x
3. Step 3: Cross multiply
   61,056.64x = 91,427.24 × 42,139.67
4. Step 4: Simplify right side
   61,056.64x = 3,852,713,509.45
5. Step 5: Solve for x
   x = 3,852,713,509.45/61,056.64
6. Step 6: Final answer
   x = 63,100.64