Finding the Fourth Proportional to 99,680,185.40, 149,359,314.90 and 56,420,742.20

Step by Step Solution

1. Step 1: Write the proportion equation
   99,680,185.40 : 149,359,314.90 = 56,420,742.20 : x
2. Step 2: Convert to fraction form
   99,680,185.40/149,359,314.90 = 56,420,742.20/x
3. Step 3: Cross multiply
   99,680,185.40x = 149,359,314.90 × 56,420,742.20
4. Step 4: Simplify right side
   99,680,185.40x = 8,426,963,401,141,520
5. Step 5: Solve for x
   x = 8,426,963,401,141,520/99,680,185.40
6. Step 6: Final answer
   x = 84,540,005.29