Finding the Fourth Proportional to 61,266,187.20, 91,773,309.60 and 42,118,564.80

Step by Step Solution

1. Step 1: Write the proportion equation
   61,266,187.20 : 91,773,309.60 = 42,118,564.80 : x
2. Step 2: Convert to fraction form
   61,266,187.20/91,773,309.60 = 42,118,564.80/x
3. Step 3: Cross multiply
   61,266,187.20x = 91,773,309.60 × 42,118,564.80
4. Step 4: Simplify right side
   61,266,187.20x = 3,865,360,087,298,061.50
5. Step 5: Solve for x
   x = 3,865,360,087,298,061.50/61,266,187.20
6. Step 6: Final answer
   x = 63,091,245.99