Finding the Fourth Proportional to 99,665,632.40, 149,337,485.40 and 56,406,189.20

Step by Step Solution

1. Step 1: Write the proportion equation
   99,665,632.40 : 149,337,485.40 = 56,406,189.20 : x
2. Step 2: Convert to fraction form
   99,665,632.40/149,337,485.40 = 56,406,189.20/x
3. Step 3: Cross multiply
   99,665,632.40x = 149,337,485.40 × 56,406,189.20
4. Step 4: Simplify right side
   99,665,632.40x = 8,423,558,456,124,638
5. Step 5: Solve for x
   x = 8,423,558,456,124,638/99,665,632.40
6. Step 6: Final answer
   x = 84,518,185.99